The altercation between Greg Gianforte — who is running for the state's only congressional seat in Thursday's special election — and journalist Ben Jacobs took place at a campaign event at Gianforte's headquarters in the city of Bozeman, Montana, The Guardian said.

For centuries, herds of pronghorn have traveled hundreds of miles across the west in the second longest land migration in North America. But today, pronghorn often encounter barbed wire fences on private and public land that delay or halt their journey. Now, scientists and wildlife managers are developing fencing systems that allow the pronghorn to cross safely.

With national policy on climate and energy in political gridlock, the opponents are fighting in local and state trenches. That's why money is pouring into a small county north of Seattle, where there's a debate over a shipping terminal that would send coal to Asia.

The drive to build the Keystone XL pipeline and the deadly oil train wreck in Canada earlier this month have launched a lengthy discussion about how crude oil is moved around in this country. One critic says it should prompt a broad re-think of our use of fossil fuels.

Federal officials are considering a plan to open up federal lands to coal mining, with the idea that the coal would be exported, likely to Asia. But two governors, in Washington and in Oregon, are urging federal officials to look closely at the proposals and consider whether its in the national best interest.

A bill to keep the government operating through the end of September contained an unrelated provision that protects genetically modified food. While some say it's unconstitutional, a provision of the bill prohibits the courts from pulling an unsafe genetically modified product from the market.

What you eat ends up in your hair. Scientists in the US and Europe have used this basic idea to devise a sort of hair-based GPS tracking system. Law enforcement agencies are now using this technique to solve crimes. NOVA's Ari Daniel Shapiro reports.

With national policy on climate and energy in political gridlock, the opponents are fighting in local and state trenches. That's why money is pouring into a small county north of Seattle, where there's a debate over a shipping terminal that would send coal to Asia.

For centuries, herds of pronghorn have traveled hundreds of miles across the west in the second longest land migration in North America. But today, pronghorn often encounter barbed wire fences on private and public land that delay or halt their journey. Now, scientists and wildlife managers are developing fencing systems that allow the pronghorn to cross safely.